For those who don't have or don't want an TapaTalk ID here is how you schould login on the forum using TapaTalk.

- Add the Forum to the list of Forums in Tapatalk.
- Tap the TopSolid'Forum
- In the viewed list go to "registration" (bottom one)
- Here it seems you only have the option of a Tapatalk ID, Google+ of Facebook. However if you scrol down you will see "Join Using Another Email Adress". Tap this.
- Now a new screen appears in which you can give the same credentials as you would logging in at the forum on the internel, so you usual TopSolid'Forum Username and password.